1 10 1 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/ffadc04ed9e3124d98272e135fd7da8f.jpg db59789e6e6fd0e709090ca690e32786 https://wserv3.esc.cam.ac.uk/p1acollections/files/original/6947dd2e59661db1bf837d372feb2120.jpg 4d91339ce17b1bc0e945ae3d1d434b1c https://wserv3.esc.cam.ac.uk/p1acollections/files/original/df18c0e4e2bcbbcf532dd5fe47d3863e.jpg ca894e8b7bbf20601e7e6765893c3be6 Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource <h2><strong>L371<br /></strong></h2> <h2>Chert, bedded</h2> Subject The topic of the resource <h3>Age</h3> <div class="element-text"> <p>Early Carboniferous</p> <h3>Location</h3> <div class="element-text"> <p>Carboniferous Limestone<br />Skyes, Bowland, Yorkshire</p> </div> </div> Description An account of the resource <div class="element"> <h3>Hand Specimen</h3> <div class="element-text"> <p>Two rock types, with an irregular contact between them.</p> <p>1 – Very dark brown,<span> </span><a href="/p1acollections/items/show/227">microcrystalline</a><span> </span>rock. This fizzes with acid. It is a limestone.</p> <p>2 – Grey and black, intermingled, microcrystalline silica. Brittle and well jointed. Some medium grained white quartz vein material.</p> </div> </div> <div class="element"> <h3>Thin-section</h3> <div class="element-text"> <p>1 – A fine to medium grained mosaic of calcite with cross-sections of foraminifera and other shell material.</p> <p>2 – Microcrystalline silica, quartz forming a uniform mosaic texture, slightly coarser in some places than others. Scattered with grains of calcite and<span> </span><span>opaques</span>, both typically 0.1 mm across. Criss-crossing calcite veins, some dark red-brown discolouration.</p> </div> </div> <div class="element"> <h3>Rock History</h3> <div class="element-text">This rock has a complicated history. In essence the chert (2) has replaced the limestone (1). The irregular patches of limestone within the chert are probably relics of pre-existing limestone, but the calcite rhombs are related to the calcite veining and therefore later than the chert. Similarly the opaques, which cut across the structure of the chert, formed later than the chert.</div> </div> <div class="element"> <h3>Advanced Notes</h3> <div class="element-text"> <p>The cubic<span> </span><a href="/p1acollections/items/show/206">form</a><span> </span>of the<span> </span><span>opaques</span><span> </span>is suggestive of pyrite, but we cannot be sure.</p> </div> </div> <div class="element"></div> <div class="element"> <h3>Rock Name</h3> <div class="element-text">bedded chert</div> </div> conchoidal microcrystalline replacement